Li, Huixia
Yuan, Shan
Fang, Hualing
Huang, Guangwen
Huang, Qun
Wang, Hua
Wang, Aihua
Article History
Received: 3 February 2021
Accepted: 28 February 2022
First Online: 11 March 2022
Declarations
:
: The study protocol was approved by the Ethics Committee of Hunan Provincial Maternal and Child Health Care Hospital (No.2019-S036). The study was conducted in accordance with the Declaration of Helsinki. Written informed consents were obtained from all the caregivers of children involved in this study.
: Not applicable
: The authors declared that they have no competing interest.